Science of Breath is a Complete Manual of the Oriental Breathing Philosophy of Physical, Mental, Psychic and Spiritual Development. First published in 1903, "Science of Breath" is the first of many titles on yoga and Hinduism by the mysterious Yogi Ramacharaka. There are no official records of this author and many scholars believe that he did not exist and the name is instead a pseudonym for the true writer, William Walker Atkinson, the famed occultist and pioneer of the American New Thought movement. Regardless of the identity of the author, "Science of Breath" is an in-depth and well-written guide on both the science and philosophy of breathing in yoga and contains numerous lessons and exercises that remain useful over 100 years after its publication.